September weather in Coupeville, WA
The average temperature in Coupeville in September is 57.6°F (49.4°F–65.8°F). Average precipitation: 1.22 inches.
September is a fall month in Coupeville, and is warmer than the annual average of 50.2°F. Daily temperatures swing about 16.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
65.8°F
Avg Low
49.4°F
Precipitation
1.22 in
Daylight
12h 20m
September records in Coupeville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 82.9°F (1969) | 37.0°F (1973) | 2.25 in (1983) |
| September 2 | 90.0°F (1974) | 37.9°F (1960) | 0.95 in (1907) |
| September 3 | 84.0°F (2003) | 39.0°F (1929) | 1.03 in (1996) |
| September 4 | 82.9°F (1962) | 39.0°F (1956) | 0.61 in (1922) |
| September 5 | 82.9°F (1955) | 37.9°F (1969) | 1.22 in (1931) |
| September 6 | 86.0°F (1986) | 37.0°F (1969) | 0.68 in (2015) |
| September 7 | 88.0°F (1898) | 39.0°F (1929) | 0.88 in (1952) |
| September 8 | 84.0°F (1898) | 36.0°F (1936) | 0.32 in (1972) |
| September 9 | 86.0°F (1907) | 37.0°F (1962) | 0.63 in (1978) |
| September 10 | 82.9°F (1944) | 39.0°F (1961) | 0.51 in (2019) |
| September 11 | 82.0°F (1957) | 37.0°F (1949) | 1.13 in (1907) |
| September 12 | 81.0°F (1961) | 36.0°F (1949) | 0.43 in (1940) |
| September 13 | 87.1°F (1961) | 35.1°F (1970) | 0.47 in (2004) |
| September 14 | 82.9°F (1937) | 37.9°F (1896) | 0.80 in (1997) |
| September 15 | 91.0°F (1967) | 36.0°F (1936) | 1.18 in (1907) |
| September 16 | 89.1°F (1967) | 36.0°F (1936) | 0.72 in (1964) |
| September 17 | 78.1°F (1984) | 34.0°F (1965) | 0.88 in (1964) |
| September 18 | 79.0°F (1962) | 35.1°F (1963) | 0.67 in (1983) |
| September 19 | 81.0°F (1901) | 36.0°F (1947) | 0.50 in (2007) |
| September 20 | 84.9°F (1976) | 35.1°F (1983) | 0.70 in (1944) |
| September 21 | 80.1°F (1974) | 35.1°F (1932) | 0.48 in (1972) |
| September 22 | 80.1°F (1990) | 34.0°F (1955) | 0.99 in (1900) |
| September 23 | 82.9°F (1957) | 33.1°F (1926) | 0.64 in (1977) |
| September 24 | 81.0°F (1974) | 28.9°F (1926) | 0.99 in (1945) |
| September 25 | 78.1°F (1974) | 30.0°F (1926) | 0.32 in (2013) |
| September 26 | 75.0°F (2006) | 34.0°F (1926) | 0.76 in (1948) |
| September 27 | 81.0°F (1967) | 28.9°F (1972) | 0.71 in (1930) |
| September 28 | 81.0°F (2003) | 34.0°F (1929) | 0.51 in (1953) |
| September 29 | 77.0°F (1935) | 33.1°F (1961) | 1.17 in (1944) |
| September 30 | 75.9°F (1957) | 36.0°F (1929) | 0.61 in (2000) |